penta = [ 1, 5, 12, 22, 35, 51, 70, 92, 117, 145, 176, 210, 247, 287, 330, 376, 425, 477, 532, 590, 651, 715, 782, 852, 925, 1001, 1080, 1162, 1247, 1335, 1426, 1520, 1617, 1717, 1820, 1926, 2035, 2147, 2262, 2380, 2501, 2625, 2752, 2882, 3015, 3151, 3290, 3432, 3577, 3725, 3876, 4030, 4187, 4347, 4510, 4676, 4845, 5017, 5192, 5370, 5551, 5735, 5922, 6112, 6305, 6501, 6700, 6902, 7107, 7315, 7526, 7740, 7957, 8177, 8400, 8626, 8855, 9087, 9322, 9560, 9801 ]
